CAJ | 학술논문

将对称极坐标方法和数字图像处理技术结合并应用到柴油机机械故障诊断中。根据对称极坐标方法把不同磨损工况的柴油机连杆轴承振动信号转换成镜面对称雪花图；提出改进面积开运算方法对雪花状图像降噪；分割降噪前后图像特征区域并提取特征参数以反映不同磨损故障程度；最后采用模糊 C均值聚类方法评价降噪效果和实现故障分类。试验结果表明，对称极坐标方法能定量地描述柴油机机械故障，改进面积开运算降噪方法能提高和改善柴油机故障诊断的准确率和效果。
장대칭겁좌표방법화수자도상처리기술결합병응용도시유궤궤계고장진단중。근거대칭겁좌표방법파불동마손공황적시유궤련간축승진동신호전환성경면대칭설화도；제출개진면적개운산방법대설화상도상강조；분할강조전후도상특정구역병제취특정삼수이반영불동마손고장정도；최후채용모호 C균치취류방법평개강조효과화실현고장분류。시험결과표명，대칭겁좌표방법능정량지묘술시유궤궤계고장，개진면적개운산강조방법능제고화개선시유궤고장진단적준학솔화효과。
Both the symmetric polar coordinate method and digital image processing technology were applied to diesel engine fault diagnosis .By using the symmetric polar coordinate ,the connecting rod bearing vibration signal under different wear con-ditions was converted into snowflakes image with mirror symmetry .Then an improved area opening operation was put forward for the image noise reduction .The image feature area before and after noise reduction was split and the feature parameters were extracted to reflect the different degree of wearing fault .Finally ,the noise reduction effect was evaluated and the fault classifi-cation was realized with the fuzzy C-means clustering method .The experimental results show that the symmetric polar coordi-nate can describe the mechanical failure of diesel engine quantitatively and the improved area opening operation to noise reduc-tion can improve the accuracy and effect of diesel engine fault diagnosis .